diff --git a/reference/datetime/datetimeinterface/format.xml b/reference/datetime/datetimeinterface/format.xml
index 3e3f11eb04..f84416c761 100644
--- a/reference/datetime/datetimeinterface/format.xml
+++ b/reference/datetime/datetimeinterface/format.xml
@@ -89,7 +89,7 @@
N
- ISO-8601 numeric representation of the day of the week
+ ISO 8601 numeric representation of the day of the week
1 (for Monday) through 7 (for Sunday)
@@ -117,7 +117,7 @@
W
- ISO-8601 week number of year, weeks starting on Monday
+ ISO 8601 week number of year, weeks starting on Monday
Example: 42 (the 42nd week in the year)
@@ -162,7 +162,7 @@
o
- ISO-8601 week-numbering year. This has the same value as
+ ISO 8601 week-numbering year. This has the same value as
Y, except that if the ISO week number
(W) belongs to the previous or next year, that year
is used instead.